I found it fairly hard but got out of the gym nice and quick-i was out in under an hour-which included chatting to a few people. Would this be considered enough volume for the back and bi's for one workout?

I think it boils down to what your goals are but looks fine to me. I don't know what a spider curl is but your biceps are getting worked from the chins also, which is great. Others may say otherwise, but sounds good to me. Chins are a fantastik exercise!

Yeh, I figured the bicep was getting worked with the chins, which uses a lot of weight to encourage mass.
The spider curl is to encourage bicep peak. This video explains what a spider curl is. I love them-it gives my bis the biggest pump.

The main thing would be to progressively overload the session. You can easily do just chins/pullups and row variations for lats/teres major and rhomboids/mid and lower-traps. Switching your grips, using a weight belt/vest, going from BB to DB, etc.

I found it fairly hard but got out of the gym nice and quick-i was out in under an hour-which included chatting to a few people. Would this be considered enough volume for the back and bi's for one workout?